Leveling millstones



No. 30,454. Patented Oct. 23. 1860.

UNITED STATES PATENT OFFICE.

DANIEL A. BALMER, OF LEXINGTON, INDIANA.

LEVELING MILLSTONES.

Specification of Letters Patent No. 30,454, dated October 23, 1860.

To all whom it may concern:

Be it known that I, DANIEL A. BALMER, of Lexington, in the county of Scott and State of Indiana, have invented a new and Improved Device for Leveling Millstones; and I do hereby declare that the following is a full, clear, and exact description of the same, reference being had to the accompanying drawing, forming a part of this specification, in which Figure 1, is a longitudinal vertical section of my invention. Fig. 2, represents a plan or top View of the same. Fig. 3, is a longitudinal vertical section of a proof staff or a device which I use for the purpose of adj usting the edges of the sweeps of my device.

Similar letters of reference in the three figures indicate corresponding parts.

The object of this invention is to arrange the sweeps over the face of a millstone in such a manner that all the inequalities existing in said face can be easily detected and mended. The devices heretofore used for this purpose are defective chiefly because when once adjusted they can not be taken off and put back again to their place without requiring a fresh adjustment of the sweeps. By this defect said devices are rendered almost useless, for the sweeps after having been adjusted so as to point out the high parts of the stone, have to be taken off in order to be able to get at the whole surface of the stone with the pick. In order to overcome this difficulty I have arranged the arms which carry the sweeps in combination with two rings and with a central screw in such a manner that the inner one of said rings can be secured to the cockhead of the spindle,while the outer or largest ring which forms the guide for the arms,is adjusted on the four stools, and that the sweeps can now be put on and taken off at pleasure.

To enable those skilled in the art to make and use my invention I will proceed to describe its construction and operation with reference to the drawing.

The ring A. which is intended to be fas' tened to the cockhead of the spindle by means of set screws a, as clearly shown in Fig. 1, is provided with two arms 7), which mute on the top forming a boss 0, through which the central screw B, passes. This screw is firmly secured in the center of the standard C, which extends down on both sides being rigidly attached to the circular body or ring D, and a nut d, on the lower end of the central screw B, serves to fasten the inner ring A, firmly to the standard C. The ring D, is provided on its inside with four lugs e, to receive set screws E, which serve to adjust said ring on the four stools of the stone.

The upper edge of the ring D, is turned off true and it forms the guide for the lower edges of the yoke F, which bends up, being perforated in its center with a hole f, to admit the upper end of the central screw B, so that it can be revolved around said screw with perfect facility. A collar G, which slips over the screw B, and which is fastened to the same by means of a set screw g, retains the yoke F, and prevents an up ward motion of the same, and the collar G, is further secured in its position by a nut H, which screws on the top end of the central screw B. Two arms I, are secured to the yoke F, one 011 each side and these arms carry the sweep staffs J. Screws h, which pass through vertical slots z', in said sweeps, serve to secure them in the desired position and said sweeps are adjusted in an up and down direction by means of set screws 9', which pass through flanges is, extending from the arms I, over the top edges of the sweeps.

It is essential of course to have the lower edge of said sweeps perfectly straight, and in order to effect this purpose I use a device such as shown in Fig. A series of wires Z, are stretched across a frame K, by means of pins on, similar to the tuning pins of a violin or guitar. By keeping these wires taut all the inequalities which may exist in the edge of the sweep-staffs can be detected and the defect can easily be remedied.

The operation is as follows: The inner ring A, is set over the cockhead of the spindle and fastened to it by the setscrews a. The outer ring D, is now set over it with its bolt B, entering through the boss of the inner ring A, and the four setscrews E, are set on the four stools. The sweepstafi's are put on and adjusted parallel with the face of the stone as near as may be by means of the setscrews E, and the yoke F, is secured in its place by the collar G, and nut H. The whole device is now fastened to the spindle by screwing up the nut 03, and sweepstaffs may now be adjusted again if it is found necessary. If the sweepstafis. are now turned around, the highplaces of the stone are detected, and by taking out the yoke F, the entire surface of the stone is left unobstructed and the high places can readily be dressed down. The yoke is now replaced, the sweeps are set a little lower by means of the setscrews 9', etc., until the surface of the stone is perfectly level. By attaching suitable stones to the arms I, the surface of the millstone may now be ground perfectly smooth.

The operation of this device is Very simple and it will be readily understood by any practical man, and all its parts are so constriicted that they cannot readily get out of 15 or er.

What I claim as new and desire to secure by Letters Patent, is

The arrangement of the ring D, with the setscrews E, and central screw B, in combi- 20 nation with the inner ring A, yoke F, and arms I, the whole being constructed and operating as and for the purpose herein set forth.

DANIEL A. BALMER. WVitnesses:

SAMUEL S. CRowE, PATRICK H. JARDS. 

